Add 21/80 and 15/8
1st number: 21/80, 2nd number: 1 7/8
21/80 + 15/8 is 171/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 8 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Likewise, for the 2nd fraction, since 8 × 10 = 80,
15/8 = 15 × 10/8 × 10 = 150/80 - Add the two like fractions:
21/80 + 150/80 = 21 + 150/80 = 171/80 - So, 21/80 + 15/8 = 171/80
In mixed form: 211/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+15/8 21/80+30/8 21/80+15/16 63/80+15/8 21/80+45/8 21/80+15/24 21/80+75/8 21/80+15/40 21/80+15/56